Adjustable chair.



J. F. WALTON= ADJUSTABLE CHAIR.

APPLICATION FILED APR.26. 1915.

1 ,251,71 4. Patented Jam. 1, 1918.

WITNESSES: INI/ENTOR .emgi B Q A TTORNEKS assess I renew $39I$ enema ADJUSTABLE CHAIR;

Speeiiicatiohpf Letters Patent; "Patented: 1, 1918,

ss n ear iea ne eme t r at 19 s e amms deeil l-st 1.9 s .ue'zeeai s. iiill is stresses enifeii i lfi I alllwlromz't mag concern: i J

Be'fi't 1tliat'I,"'Jnii oLn VF. WALTON, a citizen of'tlie United state's,"re .iQ Tig-at a in the county .o St loii State of Michigan, have inventedcertain new and useful Improvements inAdjustable Chairs, of which the followingisa'specL fication. V

Th1s invention relates to improvements 1n adillsteble chainsawhis a rlieati n is division of my patent dated Aprll 27,--l Q 1,,,.-

The object of this invention is to provide an improved detachable hinge structure for the back of an adjustable chair which facilitates the assembling thereof.

Further objects and objects relating to details of construction and operation will definitely appear from the detailed description to follow.

I accomplish the objects of my invention by the devices and means described in the following specification. The invention is clearly defined and pointed out in the claims.

A structure constituting a preferred embodiment of my invention is clearly illustrated in the accompanying drawing, forming a part of this specification, in which:

Figure I is a detail rear elevation view of a part of a chair showing the rear part and a part of the back with my improved hinge in place.

Fig. II is a detail perspective view of the lower part of a chair back with the back members of my improved hinge in place.

Fig. III is an enlarged detail perspective view of one of the pivot hinge members at the lower corner of the chair back.

Fig. IV is a detail sectional view on line 44 of Fig. III, showing the details of construction, a portion of the engaging lug being shown in full lines.

Fig. V is an enlarged detail perspective view of the pivot plate member of the hinge joint secured to the chair frame.

Fig. VI is an enlarged detail transverse sectional view on a line corresponding to line 66 of Figs. I and IV, showing the relations of the members of the hinge joint of the chair back when assembled.

In the drawing all of the sectional views are takenlooking in the direction of the little arrows at the ends of the section hnes th c a rabackwhich is retained in Js 'i li. Mati and similar; numerals of reference refer, to 'sjiniilariparts throughout, the: s en eral views.

BQferring'to the numbered e. of he drawing, the :I'eai' postflor lg l of thc ch air. supports the usual rail 2 and the lside railiZ. I The chair 111E),ofl sid e v 133 3 Q Liee s b e se b r 4. a ewe bars 5 abbve esaieat which i see nected any convenient means for adjusting The pivot member comprises the plate 6 place on the side bar 3 by screw 7 and is provided with a cylindrical boss 9 on its back fitting into a suitable socket or hole in the lower end of the rail 3. A pivot stud 8 with T-shaped head projects out for engagement with the corre sponding hinge member carried by the chair post 1. The cylindrical lug 9 being fitted into a large hole 10 would tend to weaken the lower end of the side bar 3, but this is reinforced by the transverse pin 11 suitably headed and riveted in place, or the same may be a small bolt. v

By this construction a very strong pivot is provided at each side of the bottom end of the chair back.

The hinge member on the chair part comprises the plate 12 with a horizontally disposed projectingend 12 secured to the post 1 and the back rail 2 by suitable screws 13.

A keyhole slot consisting of the rounded lower portion 15 and the upper slot portion 14 is formed in a struck-up portion of the plate 12, whereby the T-shaped head of the pivot may be inserted when the chair back is swung forward to the horizontal position. When the chair back is swung to the vertical position the T-shaped head 8 engages the opposite side of the perforation 15 and holds the side posts together and forms a very secure and satisfactory pivot or hinge for the bottom end of the chair back, the same being supported by substantially the full strength of the large lug 9, which is prevented from splitting the back by the transverse pin 11 already pointed out.

From this description it will be clear that the parts constituting this hinge in place of being a source of weakness to the parts, greatly enhance their strength, which is desirable at this point where the heavy strain occurs.

The structure is capable of considerable modification without departing from my invention as particularly pointed out in the appended claims. I

Having thus described my invention what I claim as new and desire to secure by Letters Patent is:

1. In a chair, the combination of the.

frame, a seat, a hinged back comprising sides and cross pieces, separable hinge members comprising a plate with a key-hole slot secured to the said chair frame, a plate with a suitable pivot pin for engaging the slot of said plate having a cylindrical boss projecting opposite said pin into the framework of the said chair back; and suitable reinforce means for the side piece of the said chair back disposed therethrough adjacent to and transversely of said boss, coacting for the purpose specified.

2. In a chair, the combination of a frame comprising rear posts and rear rail, of a hin ed back provided with T-shaped pivot studs, angle plate sheet metal members having oflsets therein with upwardly pointing my hand and seal in the, presence of'two witnesses. v p

JERROLD F. WALTON. {13.8.1 or

Witnesses; v

F. T. SMITH,

ALVENA K. SCHAFER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, I). C. 

